Sorry for the false alarm - results from glmer in the released lme4 are consistent with other software
In general S4 seems slow to load relative to S3. You can generally tell whether a package is S3 or S4 just by the time it takes to load. However, if there is some special situation that makes S4 take even longer than usual it would be useful to know what it is.so others can avoid the problem in situations related or unrelated to lme4a.
On Fri, Mar 5, 2010 at 9:05 AM, Douglas Bates <bates at stat.wisc.edu> wrote:
In an earlier thread with the subject "lme4a, glmer and all that" I stated that the results of fitting generalized linear mixed models in the lme4 and lme4a packages were different and I was beginning to doubt the results from the released version 0.999375-32 of lme4. ?I did discover a programming mistake in the development version, lme4a, and am working on correcting it. ?The results from the released version, lme4, are consistent with those reported by other software. In an unrelated development we have discovered one of the reasons that the lme4 package takes a very long time to load, relative to other packages. ?It has always seemed peculiar that the Matrix package with dozens of S4 classes and hundreds of methods takes a couple of seconds to load whereas the much simpler lme4 package (in terms of classes and methods) takes 5 to 10 times as long. ?We have isolated why this occurs and John Chambers is testing a modification in the methods package that can avoid this.
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